Refrigeration Service Procedures
141
4. Tighten the receiver tank mounting hardware
securely.
5. Pressurize the system and test for leaks.
6. If no leaks are found, replace the liquid line
drier then evacuate the
system.
7. Recharge the unit with refrigerant and check
the compressor oil.
Solenoid Valve Replacement
Removal
1. Recover the refrigerant charge.
2. Remove the coil from the valve.
3. Remove the valve mounting hardware if used.
4. Unsolder the refrigeration lines from the valve
and remove the valve from the unit.
Installation
1. Clean the tubes for soldering.
2. Remove the coil and place the valve in
position.
3. Install the valve mounting hardware if used.
4. Solder the inlet and outlet connections. After
the valve cools, install the coil.
5. Pressurize the refrigeration system and test for
leaks.
6. If no leaks are found, replace the liquid line
drier then evacuate the system.
7. Recharge the unit with proper refrigerant and
check the compressor oil.
Suction Pressure Regulator
(SPR) Test
1. Attach a gauge manifold to the suction service
valve and the discharge service port. A low
loss fitting must be used on the hose
connected to the discharge service port.
2. Operate the unit in high speed heat until the
system pressures stabilize.
3. Check the suction pressure on the gauge
attached to the suction service port. It should
be within the range shown for the SPR setting
in the “Specifications” chapter. If the setting is
incorrect, remove the protective cap and try to
adjust the SPR to the correct setting before
assuming it is faulty.
4. Remove the gauges to return the unit to
normal operation.
CAUTION: Use a heat sink to prevent
damage.
CAUTION: Use a heat sink to prevent
damage.
Summary of Contents for UT-1200
Page 10: ...Table of Contents 10...
Page 20: ...Safety Precautions 20...
Page 76: ...Operating Instructions for Premium HMI Control Panel 76...
Page 88: ...Electrical Maintenance 88...
Page 98: ...Engine Maintenance 98 Figure 167 Fuel Components...
Page 142: ...Refrigeration Service Procedures 142...
Page 148: ...Clutch Maintenance 148...
Page 150: ...Structural Maintenance 150...
Page 162: ...Wiring and Schematic Diagrams Index 162...
Page 163: ...163 Schematic Diagram Page 1 of 2...
Page 164: ...164 Schematic Diagram Page 2 of 2...
Page 165: ...165 Wiring Diagram Page 1 of 5...
Page 166: ...166 Wiring Diagram Page 2 of 5...
Page 167: ...167 Wiring Diagram Page 3 of 5...
Page 168: ...168 Wiring Diagram Page 4 of 5...
Page 169: ...169 Wiring Diagram Page 5 of 5...